Re: [Drakelist] TR7 Help please
Any good quality 10-turn pot with the correct value that fits on the board will do the job. We used the Bourns types because they are common available here. Keep in mind that there are at least two different types of power boards used in the TR7. That's why I used the vertical mounted types and Rien - PA0TRT the horizintal mounted models. Carel - PA0CMU. Date: Sun, 13 Dec 2009 01:10:47 -0500 To: drakelist@zerobeat.net From: epy...@indy.rr.com Subject: Re: [Drakelist] TR7 Help please You need one Bourns 1k pot 3296W-1-102LF for the 10 volt adjustment, and 5 Bourns 10k pots 3296W-1-103LF for the passband frequency adjustments. They are $2.19 each at Newark. 73 Joe Pyles, KC9LAD At 03:42 PM 12/12/2009, you wrote: It's been a while now, so I don't recall if the exact numbers listed there are still available, but you should be able to find out on mouser.com - that's where I bought mine. Note that a resistor (one per pot) located near each pot position must be relocated to the back of the board to make room for the pots. _ New Windows 7: Find the right PC for you. Learn more. http://windows.microsoft.com/shop___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
You need one Bourns 1k pot 3296W-1-102LF for the 10 volt adjustment, and 5 Bourns 10k pots 3296W-1-103LF for the passband frequency adjustments. They are $2.19 each at Newark. 73 Joe Pyles, KC9LAD At 03:42 PM 12/12/2009, you wrote: It's been a while now, so I don't recall if the exact numbers listed there are still available, but you should be able to find out on mouser.com - that's where I bought mine. Note that a resistor (one per pot) located near each pot position must be relocated to the back of the board to make room for the pots. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Here's the link to the original article: http://members.ziggo.nl/cmulder/drake.htm#bookmark5 It's been a while now, so I don't recall if the exact numbers listed there are still available, but you should be able to find out on mouser.com - that's where I bought mine. Note that a resistor (one per pot) located near each pot position must be relocated to the back of the board to make room for the pots. 73, K8AC - Original Message - From: "Jack" To: "K8AC" Cc: "Adrian Rees (MW1LCR)" ; "'drakel...@.zerobeat.net'" Sent: Saturday, December 12, 2009 3:26 PM Subject: Re: [Drakelist] TR7 Help please Hi All, Does anyone know the Bourns (also Dale maybe?) 10 turn pot part number that will drop into the TR-7? I have been wanting to do that for a while. Those one turn guys are just too touchy. Thanks. 73, Jack WA9NQW On Dec 12, 2009, at 1:50 PM, K8AC wrote: Make sure to check the 10V adjustment FIRST! This affects everything and is the reason you need to use the PBT to tune in SSB. The Service Manual covers that well and shows it as the first step. The adjustment pot is on the power supply board and easy to bump, throwing everything that depends on the 10V line off. As I mentioned in a previous email, the real solution to that repeating problem is to replace the adjustment pots on the power supply board with multi-turn Bourns pots which won't change value when bumped or vibrated. 73, Floyd - K8AC - Original Message - From: "Adrian Rees (MW1LCR)" To: "'drakel...@.zerobeat.net'" Sent: Saturday, December 12, 2009 2:25 PM Subject: Re: [Drakelist] TR7 Help please Hello everyone I have now stripped & cleaned the Molex connectors,and all the connectors on the Digital display board. This leaves So far my TR7 is now receiving on all bands apart from 28MHz. I injected a signal on the amateur bands at 1uV and this was certainly discernable. However, still no 28MHz and now 7MHz appears to be starting at 8MHz and I press the "down" button twice to get to 7MHz. Changing the band switch up or down and then returning to 7MHz does the same...ie 8MHz.So I guess further board cleaning is called for tomorrow.I'll finish off the connectors and switches tomorrow. I tried the RX sie of things and noticed that the PBT is needed to resolve an SSB signal, so I guess I need to look at that as well. I'll get the receive side going on all bands first, then look at alignment & voltages. Thanks all for the help so far. Regards Adrian MW1LCR -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Adrian Rees (MW1LCR) Sent: 12 December 2009 09:27 To: 'drakel...@.zerobeat.net' Subject: Re: [Drakelist] TR7 Help please Hello everyone Thank you all for your replies, both on and off list. I'll start by stripping & cleaning the PC Board connectors, as per the many suggestions I received. Over here in the UK, we have a product called Servisol, which I guess is the same as your Dexoit. Both switch & contact cleaners. The guy I bought the TR7 from had started restoring the radio and had changed two transistors, before stopping work on it. These were two transistors are in the power supply section, specifically Q2104 and Q2105 (TIP31). He had also acquired two spare boards for the radio, an IF Switching board and what appears to be a interstage RF amplifier, identified by the serial C3988W on the board. I'll clean the connectors and see what we have got then. Since it's a week or two before Christmas, and we live up in the hills, the XYL wants to go shopping, so its doubtful I'll achieve much on it today, although I may have time this evening, between contacts in the UBA Low Band contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 & Dentron Linear for a bit of nostalgia !) Best wishes & many thanks ! Adrian MW1LCR North Wales. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Hi All, Does anyone know the Bourns (also Dale maybe?) 10 turn pot part number that will drop into the TR-7? I have been wanting to do that for a while. Those one turn guys are just too touchy. Thanks. 73, Jack WA9NQW On Dec 12, 2009, at 1:50 PM, K8AC wrote: > Make sure to check the 10V adjustment FIRST! This affects everything and is > the reason you need to use the PBT to tune in SSB. The Service Manual covers > that well and shows it as the first step. The adjustment pot is on the > power supply board and easy to bump, throwing everything that depends on the > 10V line off. As I mentioned in a previous email, the real solution to that > repeating problem is to replace the adjustment pots on the power supply board > with multi-turn Bourns pots which won't change value when bumped or vibrated. > > 73, Floyd - K8AC > > - Original Message - From: "Adrian Rees (MW1LCR)" > > To: "'drakel...@.zerobeat.net'" > Sent: Saturday, December 12, 2009 2:25 PM > Subject: Re: [Drakelist] TR7 Help please > > >> Hello everyone >> >> I have now stripped & cleaned the Molex connectors,and all the connectors on >> the Digital display board. >> This leaves >> >> So far my TR7 is now receiving on all bands apart from 28MHz. I injected a >> signal on the amateur bands at 1uV and this was certainly discernable. >> However, still no 28MHz and now 7MHz appears to be starting at 8MHz and I >> press the "down" button twice to get to 7MHz. Changing the band switch up or >> down and then returning to 7MHz does the same...ie 8MHz.So I guess further >> board cleaning is called for tomorrow.I'll finish off the connectors and >> switches tomorrow. >> >> I tried the RX sie of things and noticed that the PBT is needed to resolve >> an SSB signal, so I guess I need to look at that as well. >> >> I'll get the receive side going on all bands first, then look at alignment & >> voltages. >> >> Thanks all for the help so far. >> >> Regards >> >> Adrian MW1LCR >> -Original Message- >> From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] >> On Behalf Of Adrian Rees (MW1LCR) >> Sent: 12 December 2009 09:27 >> To: 'drakel...@.zerobeat.net' >> Subject: Re: [Drakelist] TR7 Help please >> >> >> Hello everyone >> >> Thank you all for your replies, both on and off list. >> >> I'll start by stripping & cleaning the PC Board connectors, as per the many >> suggestions I received. >> >> Over here in the UK, we have a product called Servisol, which I guess is the >> same as your Dexoit. Both switch & contact cleaners. >> >> The guy I bought the TR7 from had started restoring the radio and had >> changed two transistors, before stopping work on it. These were two >> transistors are in the power supply section, specifically Q2104 and Q2105 >> (TIP31). >> >> He had also acquired two spare boards for the radio, an IF Switching board >> and what appears to be a interstage RF amplifier, identified by the serial >> C3988W on the board. >> >> I'll clean the connectors and see what we have got then. >> >> Since it's a week or two before Christmas, and we live up in the hills, the >> XYL wants to go shopping, so its doubtful I'll achieve much on it today, >> although I may have time this evening, between contacts in the UBA Low Band >> contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 >> & Dentron Linear for a bit of nostalgia !) >> >> Best wishes & many thanks ! >> >> Adrian MW1LCR >> >> North Wales. >> >> >> >> ___ >> Drakelist mailing list >> Drakelist@zerobeat.net >> http://mailman.zerobeat.net/mailman/listinfo/drakelist >> >> >> ___ >> Drakelist mailing list >> Drakelist@zerobeat.net >> http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > ___ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Make sure to check the 10V adjustment FIRST! This affects everything and is the reason you need to use the PBT to tune in SSB. The Service Manual covers that well and shows it as the first step. The adjustment pot is on the power supply board and easy to bump, throwing everything that depends on the 10V line off. As I mentioned in a previous email, the real solution to that repeating problem is to replace the adjustment pots on the power supply board with multi-turn Bourns pots which won't change value when bumped or vibrated. 73, Floyd - K8AC - Original Message - From: "Adrian Rees (MW1LCR)" To: "'drakel...@.zerobeat.net'" Sent: Saturday, December 12, 2009 2:25 PM Subject: Re: [Drakelist] TR7 Help please Hello everyone I have now stripped & cleaned the Molex connectors,and all the connectors on the Digital display board. This leaves So far my TR7 is now receiving on all bands apart from 28MHz. I injected a signal on the amateur bands at 1uV and this was certainly discernable. However, still no 28MHz and now 7MHz appears to be starting at 8MHz and I press the "down" button twice to get to 7MHz. Changing the band switch up or down and then returning to 7MHz does the same...ie 8MHz.So I guess further board cleaning is called for tomorrow.I'll finish off the connectors and switches tomorrow. I tried the RX sie of things and noticed that the PBT is needed to resolve an SSB signal, so I guess I need to look at that as well. I'll get the receive side going on all bands first, then look at alignment & voltages. Thanks all for the help so far. Regards Adrian MW1LCR -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Adrian Rees (MW1LCR) Sent: 12 December 2009 09:27 To: 'drakel...@.zerobeat.net' Subject: Re: [Drakelist] TR7 Help please Hello everyone Thank you all for your replies, both on and off list. I'll start by stripping & cleaning the PC Board connectors, as per the many suggestions I received. Over here in the UK, we have a product called Servisol, which I guess is the same as your Dexoit. Both switch & contact cleaners. The guy I bought the TR7 from had started restoring the radio and had changed two transistors, before stopping work on it. These were two transistors are in the power supply section, specifically Q2104 and Q2105 (TIP31). He had also acquired two spare boards for the radio, an IF Switching board and what appears to be a interstage RF amplifier, identified by the serial C3988W on the board. I'll clean the connectors and see what we have got then. Since it's a week or two before Christmas, and we live up in the hills, the XYL wants to go shopping, so its doubtful I'll achieve much on it today, although I may have time this evening, between contacts in the UBA Low Band contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 & Dentron Linear for a bit of nostalgia !) Best wishes & many thanks ! Adrian MW1LCR North Wales. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Hello everyone I have now stripped & cleaned the Molex connectors,and all the connectors on the Digital display board. This leaves So far my TR7 is now receiving on all bands apart from 28MHz. I injected a signal on the amateur bands at 1uV and this was certainly discernable. However, still no 28MHz and now 7MHz appears to be starting at 8MHz and I press the "down" button twice to get to 7MHz. Changing the band switch up or down and then returning to 7MHz does the same...ie 8MHz.So I guess further board cleaning is called for tomorrow.I'll finish off the connectors and switches tomorrow. I tried the RX sie of things and noticed that the PBT is needed to resolve an SSB signal, so I guess I need to look at that as well. I'll get the receive side going on all bands first, then look at alignment & voltages. Thanks all for the help so far. Regards Adrian MW1LCR -Original Message- From: drakelist-boun...@zerobeat.net [mailto:drakelist-boun...@zerobeat.net] On Behalf Of Adrian Rees (MW1LCR) Sent: 12 December 2009 09:27 To: 'drakel...@.zerobeat.net' Subject: Re: [Drakelist] TR7 Help please Hello everyone Thank you all for your replies, both on and off list. I'll start by stripping & cleaning the PC Board connectors, as per the many suggestions I received. Over here in the UK, we have a product called Servisol, which I guess is the same as your Dexoit. Both switch & contact cleaners. The guy I bought the TR7 from had started restoring the radio and had changed two transistors, before stopping work on it. These were two transistors are in the power supply section, specifically Q2104 and Q2105 (TIP31). He had also acquired two spare boards for the radio, an IF Switching board and what appears to be a interstage RF amplifier, identified by the serial C3988W on the board. I'll clean the connectors and see what we have got then. Since it's a week or two before Christmas, and we live up in the hills, the XYL wants to go shopping, so its doubtful I'll achieve much on it today, although I may have time this evening, between contacts in the UBA Low Band contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 & Dentron Linear for a bit of nostalgia !) Best wishes & many thanks ! Adrian MW1LCR North Wales. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Adrian, There are two boards that are commonly found with a TR-7. One is the board needed to operate the rig when the DR-7 digital display board is removed for testing or alignment. It is labeled C3990W and is shown here: http://incolor.inetnebr.com/jshorney/tr7ext.htm The other is the board which is removed when the NB-7 noise blanker is installed. Early rigs shipped without the NB-7. The later TR-7A included the NB-7 board. The NB-7 board itself is shown here: http://www.dproducts.be/Drake_Museum/images/NB7color.jpg Good luck, -Tom On Sat, Dec 12, 2009 at 3:27 AM, Adrian Rees (MW1LCR) wrote: > Hello everyone > > Thank you all for your replies, both on and off list. > > I'll start by stripping & cleaning the PC Board connectors, as per the many > suggestions I received. > > Over here in the UK, we have a product called Servisol, which I guess is > the > same as your Dexoit. Both switch & contact cleaners. > > The guy I bought the TR7 from had started restoring the radio and had > changed two transistors, before stopping work on it. These were two > transistors are in the power supply section, specifically Q2104 and Q2105 > (TIP31). > > He had also acquired two spare boards for the radio, an IF Switching board > and what appears to be a interstage RF amplifier, identified by the serial > C3988W on the board. > > I'll clean the connectors and see what we have got then. > > Since it's a week or two before Christmas, and we live up in the hills, the > XYL wants to go shopping, so its doubtful I'll achieve much on it today, > although I may have time this evening, between contacts in the UBA Low Band > contest which is on tonight & tomorrow morning.(I'm running my rebuilt > FT102 > & Dentron Linear for a bit of nostalgia !) > > Best wishes & many thanks ! > > Adrian MW1LCR > > North Wales. > > > > ___ > Drakelist mailing list > Drakelist@zerobeat.net > http://mailman.zerobeat.net/mailman/listinfo/drakelist > ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
Hello everyone Thank you all for your replies, both on and off list. I'll start by stripping & cleaning the PC Board connectors, as per the many suggestions I received. Over here in the UK, we have a product called Servisol, which I guess is the same as your Dexoit. Both switch & contact cleaners. The guy I bought the TR7 from had started restoring the radio and had changed two transistors, before stopping work on it. These were two transistors are in the power supply section, specifically Q2104 and Q2105 (TIP31). He had also acquired two spare boards for the radio, an IF Switching board and what appears to be a interstage RF amplifier, identified by the serial C3988W on the board. I'll clean the connectors and see what we have got then. Since it's a week or two before Christmas, and we live up in the hills, the XYL wants to go shopping, so its doubtful I'll achieve much on it today, although I may have time this evening, between contacts in the UBA Low Band contest which is on tonight & tomorrow morning.(I'm running my rebuilt FT102 & Dentron Linear for a bit of nostalgia !) Best wishes & many thanks ! Adrian MW1LCR North Wales. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] TR7 Help please
On Fri, 11 Dec 2009 20:54:04 -, Adrian Rees \(MW1LCR\) wrote: >So I assume the Frequency display is working OK, the IF strip & Audio stages >are OK. Readng the block diagram, I think the area I need to examine is the >VCO and all the voltages throughout the Transceiver. > >Is this the way to go ? Look in the Drakelist archives for messages related to cleaning Molex pins and re-seating boards. Then do that as the first troubleshooting step. Cures most strange problems with 7-line radios these days. Following on from that, I would look at the DC-DC converter board in the front right corner of the radio, there are a couple of well-known failures there. This board is critical to proper operation of the synthesizer. Be advised, if you even breathe on the pots at the top of this board wrong, be prepared to do a fixed passband alignment (which is simple and easy to do). 73 -Jim NU0C -- "It's an Earth food. They are called Swedish meatballs! It's a strange thing, but every sentient race has its own version of these Swedish meatballs! I suspect it's one of those great universal mysteries which will either never be explained, or which would drive you mad if you ever learned the truth!" - G'Kar, Babylon 5 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
